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Disclaimer: My experience is with home/commercial HVAC.
FYI It is a closed system, if you have to add gas you have a leak. You can add dye to the system and try to find/fix it... if you can find it... and if it is in an aluminum fitting good luck with that.
If the system has lost all its charge air/moisture has got into the system and you should do a vacuum on the system to remove the moisture (probably cheaper to take to a pro at that point).
Refrigerant is very bad for you to heath so do it in a very well ventilated area.
Not sure what the laws are in your area but in the USA there is a hefty fine if you are caught dumping refrigerant (just FYI, not judging)
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Gary Fisher 29er
2019 Kia Stinger 2.0t gone 
1995 Miata Sold
1984 944 Sold
I am not lost for I know where I am, however where I am is lost. - Winnie the poo.
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